The Greens are clearly trying to be seen as more mainstream with the launch of the campaign, “Give Green a go.” It’s clearly designed to show that people from all walks of life vote green, not just a whacky niche group. It’s also about telling voters who the Greens are. It’s not a bad idea, but the party’s success will still come down to what the message is. With their signing of the “Budget Responsibility Rules,” with Labour, this needs some...